fighting to overthrow assad? >> the al qaeda affiliates? >> rose: al nusra. >> they're the most effective fighters. >> rose: what does that mean, the most effective fighters? >> they kill the highest number of assad soldiers. they are the only force that can compete against -- remember, this has become internationalized already. people say "we're worried this is becoming internationalized." it's internationalized. you've got as many as 7,000 hezbollah fighters, iranian trained hezbollah fighters from lebanon fighting on the side of bashar al-assad already. ful these are the most experienced -- among the most experienced fighters in the middle east, terrorists, militant, however you want to describe them. >> rose: so hezbollah against al nusra? >> you've got the makings of a -- it's become a shi'a/sunni war. i mean, people -- people keep talking about, oh, we're heading into a period when we're going to have a shi'a/sunni war in five or six different places. we already have it. >>...